How do I calcuate my GPA? My final grades are just in number form and I need help please?

First find the grade for each number (e.g. 75=C, 91=A-) then give a score D=1, C=2, B=3, A=4, add those scores and divide by the number of grades.

Now is a great time to ask the question – Why are grades converted from numbers to letters and then back to numbers again? Wouldn’t it be much more efficient and accurate to simply base grades directly on the original numbers such as the ones you posted?

It depends 100% upon your school. There is no universal standard. You need to talk to your teacher/professor or guidance department or department heads or whatever.

If your class’ grade is 90+, then count it as 4.
if it’s 80–89, count it as 3.
If it’s 70–79, count it as 2.
If it’s 60–69, count it as 1.
For any class you got 59 or less on, count it as 0.

Add up all of those 4s, 3s, 2s and 1s, and divide by the number of classes you took.
The number you get after dividing by the number of classes is your GPA.

In a hypothetical situation in which you took 5 classes, and your grades for those classes were {89, 92, 76, 100, 42}, then their respective values for the GPA calculation would be {3, 4, 2, 4, 0}. Adding up to 13. Divide by 5, you’d get 2.6. So in that case, your GPA would be 2.6.
I’ll leave it up to you to calculate your own GPA.

@Sarcasm How do you know that 90+ counts as an A at poster’s school? At my school an A requires 95% or above. In my school OP would have received an A-.

@dpworkin I don’t understand your question. Regardless of whether it’s an A-, an A, or an A+, it’s still going to count for a score of 4 (even according to your first quip in this question). So does it matter whether or not there’s a negative sign at the end of it?

The more accurate way is not to go with letters, but use a direct conversion: Add, then divide by 8 (number of courses), giving 73. Set up a proportion 73/100 = X/4, X=2.92

This is the most numerically accurate, but schools might use an arbitrary 0–4 scale for each class; so it may have to be calculated in the way @Sarcasm gives. Different schools use different methods. Since you have one grade lower than 59%, your GPA calculated that way will be lower, 2.00 to be specific.

My grades of A- were not counted as a 4.0. An A- was a 3.5 and a B+ was 3 3.4.

What @stranger_in_a_strange_land said makes sense. Why give two digit numeric grades if a 59 is the same as a 0 and 69 the same as a 60?

@Sarcasm that’s simply not true. LIke I said, it depends on the school. At the college I graduated from, when I was a student, it was A = 4, B = 3, C = 2, D = 1, F = 0. At that same college, 10 years later, where I now teach, it’s:
A = 4
A – = 3.67
B+ = 3.33
B = 3
B- = 2.67
C+ = 2.33
C = 2
C- = 1.67
D+ = 1.33
D = 1
F = 0
(there was no A+ nor a D-).

No one here is qualified to give this OP an actual answer. Only someone affiliated with his school can answer this question correctly.

Furthermore, even within that one school, there is no standard as for what numeric final grades for a given course correspond to which letter grades. The letter grade is completely dependent upon the course instructor. For the course I usually teach, I tend to do 90 = A, 86.67 = A-, etc. But for the course I taught for the first time last semester, I didn’t feel I taught particularly well, and I scaled the grades so that 85 was an A, 81 was a A-, etc.

Contact the registrar or your advisor or someone and ask them what your GPA is, and how they go about calculating.